Check out the West System website (
www.westsystem.com). They have instructional videos for sale as well as a lot of free info regarding their products and how to use them.
I'd also recommend the Sam James "Fiberglass 101" video available directly from James Aircraft (
www.jamesaircraft.com) or from Aircraft Spruce (about $30 or so).
Try a small project (not on your plane) for practice. Try different techniques, epoxy with and without filler, etc. using small batches of epoxy and small pieces of glass cloth. Play with it for a couple of days and you'll discover how to wet down the cloth for layups, fill the weave, etc.
Good luck,
Mike